Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Action Potential
|
an electronic signal that propegates along the surface of the neuron's axon or skeletal muscle fiber
|
|
|
|
Resting Membrane Potential
|
an unequal buildup of ions along the inner and outer surface of the cell membrane
-70 mV of the axon |
|
|
|
action potential
phases |
1. depolarization
2. repolarization 3. hyperpolarization |
|
|
|
Depolarization
|
Na+ channels open, influx of na+ occus
-70mV to -55mV Threshold maximum +30mV |
action potential
|
|
|
repolarization
|
when membrane potential reaches +30 mV, Na+ channels close and K+ open efflux of K+
|
action potential
2nd phase |
|
|
Hyperpolarization
|
excess efflux of K+ -30 to -110 mV.
|
Action Potentia
|
|
|
???what causes a change???
|
sodium ion channels
|
Action Potentia
|
|
|
our cells like K+ inside and Na+ oustide
|
cells don't care about conecdtraton
|
Action Potentia
|
|
|
Na+/K+ Exchange Pump
|
restores resting membrane potential
ATP required 3 Na+ out for every 2 K+ in |
Action Potential
hyperpolarization |
|
|
Continuous Propagation
|
in unmyelinated axons, AP occurs at an adjacent part of the axon's membrane (shorter )
|
Action Potentia
|
|
|
Saltatory Propagation
|
in myelinated axons, the AP occurs at the next node
|
Action Potentia
|
|
|
???Generation of a single action potential
|
ASK ABOUT THIS
|
|
|
|
Central Nervous System
|
Brain and spinal cord
|
|
|
|
support and protection of CNS
|
glial cells
Meninges |
|
|
|
Meninges
|
three layers
stability, shock absorber innervated by blood vessels and oxygen |
|
|
|
three layers of Mengeal layers
|
dura mater
arachnoid mater pia mater |
|
|
|
two types of menignes
|
cranial meninges
spinal meninges |
|
|
|
three spaces associated with Meninges
|
epidural space
subdural space subarachnoid space |
|
|
|
spinal cord
|
primary passageway for motor commands from the brain and sensory information to the brain
|
|
|
|
cauda equina
|
threadlike spinal cord/nerves below L2
|
|
|
|
spinal cord segments 3
|
31 pairs
1 Dorsal root ganglia: sensory cell bodies 2 dorsal roots axons of sensory neurons 3 ventral roots: axons of CNS motor neurons that control muscles and glands |
|
|
|
spinal nerves
|
dorsal and ventral roots come together
|
|
|
|
spinal cord sections
|
Central Canal
Gray Matter White Matter |
|
|
|
membrane potential
|
unequal build up of ions along the inner and outer surface of the cell membrane. and negatively charged proteins
|
Nervous System
Action Potentials |
|
|
resting membrane potential
|
-70 mV
|
Nervous System
Action Potentials |
|
|
Action Potential
|
electrical signal that propagates along the surface of a membrane of a neuron's axon or a skeletal muscle fiber.
|
Nervous System
Action Potentials |
|
|
axon hillock
|
an action potential begin here
|
|
